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templating.go
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templating.go
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package contempt
import (
"bytes"
"encoding/json"
"fmt"
"log"
"os"
"path/filepath"
"strings"
"sync"
"text/template"
"github.com/csmith/contempt/sources"
)
var templateFuncs template.FuncMap
func init() {
templateFuncs = template.FuncMap{
"image": image,
"alpine_packages": alpinePackages,
"github_tag": gitHubTag,
"prefixed_github_tag": prefixedGitHubTag,
"git_tag": gitTag,
"prefixed_git_tag": prefixedGitTag,
"registry": sources.Registry,
"regex_url_content": regexURLContent,
"increment_int": func(x int) int {
return x + 1
},
}
addRelease("alpine", sources.LatestAlpineRelease)
addRelease("golang", sources.LatestGolangRelease)
addRelease("postgres13", sources.LatestPostgresRelease("13"))
addRelease("postgres14", sources.LatestPostgresRelease("14"))
addRelease("postgres15", sources.LatestPostgresRelease("15"))
}
func image(ref string) string {
im, digest, err := sources.LatestDigest(ref)
if err != nil {
log.Fatalf("Unable to get latest digest for ref %s: %v", ref, err)
}
materials[fmt.Sprintf("image:%s", ref)] = strings.TrimPrefix(digest, "sha256:")
return fmt.Sprintf("%s@%s", im, digest)
}
func alpinePackages(packages ...string) map[string]string {
res, err := sources.LatestAlpinePackages(packages...)
if err != nil {
log.Fatalf("Unable to get latest packages: %v", err)
}
for i := range res {
materials[fmt.Sprintf("apk:%s", i)] = res[i]
}
return res
}
func gitHubTag(repo string) string {
tag, err := sources.LatestGitHubTag(repo, "")
if err != nil {
log.Fatalf("Couldn't determine latest tag for repo %s: %v", repo, err)
}
materials[fmt.Sprintf("github:%s", repo)] = tag
return tag
}
func prefixedGitHubTag(repo, prefix string) string {
tag, err := sources.LatestGitHubTag(repo, prefix)
if err != nil {
log.Fatalf("Couldn't determine latest tag for repo %s with prefix '%s': %v", repo, prefix, err)
}
materials[fmt.Sprintf("github:%s", repo)] = strings.TrimPrefix(tag, prefix)
return tag
}
func gitTag(repo string) string {
tag, err := sources.LatestGitTag(repo, "")
if err != nil {
log.Fatalf("Couldn't determine latest tag for repo %s: %v", repo, err)
}
materials[fmt.Sprintf("git:%s", repo)] = tag
return tag
}
func prefixedGitTag(repo, prefix string) string {
tag, err := sources.LatestGitTag(repo, prefix)
if err != nil {
log.Fatalf("Couldn't determine latest tag for repo %s with prefix '%s': %v", repo, prefix, err)
}
materials[fmt.Sprintf("git:%s", repo)] = strings.TrimPrefix(tag, prefix)
return tag
}
func regexURLContent(name, url, regex string) string {
res, err := sources.RegexURLContent(url, regex)
if err != nil {
log.Fatalf("Couldn't find regex in url '%s'", name)
}
materials[fmt.Sprintf("regexurl:%s", name)] = res
return res
}
func addRelease(name string, provider func() (version, url, checksum string)) {
var version, url, checksum string
once := sync.Once{}
check := func() {
once.Do(func() {
version, url, checksum = provider()
})
}
templateFuncs[fmt.Sprintf("%s_url", name)] = func() string {
check()
materials[name] = version
return url
}
templateFuncs[fmt.Sprintf("%s_checksum", name)] = func() string {
check()
return checksum
}
}
func Generate(sourceLink, inBase, inRelativePath, outFile string) ([]Change, error) {
materials = make(map[string]string)
oldMaterials := readBillOfMaterials(outFile)
inFile := filepath.Join(inBase, inRelativePath)
tpl := template.New(inFile)
tpl.Funcs(templateFuncs)
if _, err := tpl.ParseFiles(inFile); err != nil {
return nil, fmt.Errorf("unable to parse template file %s: %v", inFile, err)
}
writer := &bytes.Buffer{}
if err := tpl.ExecuteTemplate(writer, filepath.Base(inFile), nil); err != nil {
return nil, fmt.Errorf("unable to render template file %s: %v", outFile, err)
}
bom, _ := json.Marshal(materials)
header := fmt.Sprintf("# Generated from %s%s\n# BOM: %s\n\n", sourceLink, inRelativePath, bom)
content := append([]byte(header), writer.Bytes()...)
if err := os.WriteFile(outFile, content, os.FileMode(0600)); err != nil {
return nil, fmt.Errorf("unable to write container file to %s: %v", outFile, err)
}
return diffMaterials(oldMaterials, materials), nil
}